Minor Description
The org.apache.sis.util.NullArgumentException class was added in SIS 0.3 (in 2013) for providing more helpful error message when a mandatory argument was null. But since that time, Java has improved the messages that they provide with NullPointerException. Those automatically generated messages now provide the information.
In addition, the Objects.requireNonNull(T, String) standard method has optimisations that we can not match (using JDK internal @ForceInline annotation). So we may also deprecate ArgumentChecks.ensureNonNull(…).